Answer this question truthfully
### Question: What to expect if I have Cor triatriatum  (Outlook/Prognosis)?
### Response: The prognosis of cor triatriatum depends on whether the surgery has been done. The outcomes of infants or children, who are untreated with symptomatic cor triatriatum sinistrum associated with complex congenital cardiac defects, are very poor. On the contrary, adults with isolated cor triatriatum after surgery have good outcomes.